[tests] Update to use lit_config and lit package, as appropriate.


git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@188092 91177308-0d34-0410-b5e6-96231b3b80d8
cpp11-migrate: Fixed path problem with include/exclude paths

This fixes a problem when the path separator in the include/exclude
directory is different (e.g. "\" vs. "/") from the path separator in
the file path we are modifying.

Differential Revision: http://llvm-reviews.chandlerc.com/D1326


git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@188094 91177308-0d34-0410-b5e6-96231b3b80d8